SGM3741B [SGMICRO]
High Efficiency, 4-Channel, 38V Boost White LED Driver;
| 型号： | SGM3741B |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | High Efficiency, 4-Channel, 38V Boost White LED Driver |
| 文件： | 总10页 (文件大小：565K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3741B
High Efficiency, 4-Channel,
38V Boost White LED Driver
GENERAL DESCRIPTION
FEATURES
The SGM3741B is a high efficiency constant-current
white LED driver with a 600kHz boost DC/DC converter.
With an internal 38V/2.2A power MOSFET, the
SGM3741B supports up to 10 white LEDs in series and
achieves uniform brightness. The SGM3741B supports
two PWM signals to control the backlight brightness.
The PWM frequency is in the range from 2kHz to
60kHz, thus avoiding audible noise from inductor or
ceramic capacitor. Combining the two PWM signals
gets very wide brightness dimming range. The PWM
pin is always used for Content Adaptive Brightness
Control (CABC).
• Input Voltage Range: 3V to 18V
• Integrated 38V/2.2A Switch with 0.25Ω On-
Resistance
• High Efficiency Boost Bias Supply
• Support up to 10 LEDs in Series per String
• Switching Frequency: 600kHz
• 25mA Constant Current per String
• Dual PWM Dimming Scheme for Large Dimming
Range
• PWM Dimming Frequency: 2kHz to 60kHz
• 1MΩ Pull-Down Resistor on CTRL Pin
• 500kΩ Pull-Up Resistor on PWM Pin
• Automatic Soft-Start for Reducing Inrush Current
• No Leakage from VIN to GND through LED String
• Protection Features
The supply voltage operates from 3V to 18V and is well
suited for various applications powered by 1-cell or
2-cell batteries.
Over-Voltage Protection
The SGM3741B includes a comprehensive set of
protection features such as 38.5V over-voltage
protection, cycle-by-cycle current limit and thermal
shutdown. Built-in soft-start circuitry avoids excessive
inrush current during startup.
Cycle-by-Cycle Current Limit
Thermal Shutdown
• -40℃ to +85℃ Operating Temperature Range
• Available in a Green TQFN-3×3-16L Package
APPLICATIONS
The SGM3741B is available in a Green TQFN-3×3-16L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
TFT LCD Displays
Smart Phones
TYPICAL APPLICATION
L
22μH
D1
VIN
3V to 18V
14
1
VIN
SW
SW
VOUT
CIN
22μF
COUT
1μF
2
15
16
PGND
11
PGND SGM3741B VOUT
3
6
5
PWM
CH4
PWM Dimming Control
PWM Dimming Control
CTRL
10
CH1
GND
7
SG Micro Corp
www.sg-micro.com
AUGUST2015–REV.A. 1
High Efficiency, 4-Channel,
38V Boost White LED Driver
SGM3741B
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
3741BTQ
XXXXX
SGM3741B
TQFN-3×3-16L
SGM3741BYTQ16G/TR
Tape and Reel, 4000
-40℃ to +85℃
MARKING INFORMATION
NOTE: XXXXX = Date Code and Vendor Code.
X X X X X
Vendor Code
Date Code - Week
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
ESD SENSITIVITY CAUTION
SW, VOUT, CH1, CH2, CH3, CH4 to GND........ -0.3V to 40V
VIN to GND........................................................ -0.3V to 20V
CTRL, PWM to GND............................................ -0.3V to 6V
Continuous SW Current................. Internally limited to 1.65A
Junction Temperature.................................................+150℃
Storage Temperature Range........................-65℃ to +150℃
Lead Temperature (Soldering 10s).............................+260℃
ESD Susceptibility
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................2000V
MM.................................................................................200V
DISCLAIMER
SG Micro Corp reserves the right to make any change in
RECOMMENDED OPERATING CONDITIONS
Operating Temperature Range.......................-40℃ to +85℃
circuit design, or specifications without prior notice.
OVERSTRESS CAUTION
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
SG Micro Corp
www.sg-micro.com
AUGUST 2015
2
High Efficiency, 4-Channel,
38V Boost White LED Driver
SGM3741B
PIN CONFIGURATION
SGM3741B (TOP VIEW)
PGND PGND VIN
16 15 14
NC
13
1
2
3
4
12
11
10
9
SW
SW
NC
VOUT
CH1
CH2
GND
PWM
NC
5
6
7
8
CH4 CTRL GND
CH3
TQFN-3×3-16L
PIN DESCRIPTION
PIN
NAME
FUNCTION
1, 2
SW
PWM
NC
Boost Switching Node. Connect an inductor between the VIN and SW pins.
PWM Dimming Input. Pull it high or leave it floating if unused.
3
4, 12, 13
No Connection.
5
CH4
CTRL
GND
CH3
CH2
CH1
VOUT
VIN
Current Sink 4. Connect to the cathode of the LED.
Enable Control and PWM Dimming Input.
6
7
Ground Pin.
8
Current Sink 3. Connect to the cathode of the LED.
Current Sink 2. Connect to the cathode of the LED.
Current Sink 1. Connect to the cathode of the LED.
Output Voltage Pin.
9
10
11
14
Input Supply Pin.
15, 16
Exposed Pad
PGND
GND
Power Ground Pin.
Exposed Pad. It should be soldered to PCB board and connected to GND.
SG Micro Corp
www.sg-micro.com
AUGUST 2015
3
High Efficiency, 4-Channel,
38V Boost White LED Driver
SGM3741B
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, VCTRL = VPWM = 3V, L = 10μH, CIN = 22μF, COUT = 1μF, Full = -40℃ to +85℃, typical values are at TA = +25℃, unless
otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
Full
MIN
TYP
MAX
18
UNITS
V
Input Voltage
VIN
3
Power Switch Voltage Rating
Switch Frequency
Full
38
V
Full
480
600
2.3
700
2.5
kHz
V
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
VUVLO
VIN Rising
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
Full
90
mV
mA
mA
µA
A
Not Switching
0.24
0.8
Supply Current
Switching
Supply Current in Shutdown
Switch Current Limit
ISHDN
ILIM
CTRL = GND, VIN = 3.6V
0.4
1
1.68
2.20
0.25
0.1
2.80
0.39
1
Switch On Resistance
RDS(ON)
VIN = 3.6V
Ω
Switch Leakage Current
Internal LED Current per Channel
LED Current Matching
VSW = 35V, CTRL = GND
µA
mA
%
23.7
-1.3
37.0
25
25.9
1.3
ILED = 25mA
Over-Voltage Protection Threshold
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Control
Measured at VOUT pin
38.5
145
15
40.0
V
℃
℃
Logic-High Voltage
Logic-Low Voltage
VIH
VIL
VIN = 3V to 18V
VIN = 3V to 18V
Full
1.5
V
V
CTRL, PWM Threshold
Full
0.4
Pull-Down Resistor
Pull-Up Resistor
RPULL-DOWN
RPULL-UP
tHIGH(MIN)
tLOW
1
MΩ
MΩ
μs
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
Full
0.5
CTRL Pin Logic High Pulse Width Timing
CTRL Pin Logic Low Pulse Width Timing
CTRL Pin Shutdown Pulse Width Timing
Minimum PWM On-Time
0.4
0.4
5.5
0.08
2
1000
60
μs
tOFF
ms
μs
PWM Dimming Frequency
PWM Dimming Duty Cycle (1)
kHz
%
CTRL = HIGH
0.5
+25℃
NOTE:
1. If CTRL pin PWM dimming is also used, the minimum PWM duty cycle for no blind dimming is decided by the following
conditions: the minimum LED current dimmed by two PWM is 0.5% of the internal LED current per channel.
SG Micro Corp
www.sg-micro.com
AUGUST 2015
4
High Efficiency, 4-Channel,
38V Boost White LED Driver
SGM3741B
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, ILED = 25mA, 6-Series 4-Parallel LEDs, L = 22μH, CIN = 10μF, COUT = 1μF, TA = +25℃, unless otherwise noted.
Efficiency vs. Input Voltage
LED = 25mA, L = 22μH
Supply Current vs. Input Voltage
Not Sw itching
100
90
80
70
60
50
0.5
0.4
0.3
0.2
0.1
0
I
6S4PLEDs
15 18
3
6
9
12
15
18
3
6
9
12
Input Voltage (V)
Input Voltage (V)
Sw itching Frequency vs. Input Voltage
Efficiency vs. PWM Duty Cycle
LED = 25mA, L = 22μH, fPW M = 20kHz
620
610
600
590
580
570
100
90
80
70
60
50
I
6S4PLEDs
80
0
20
40
60
100
3
6
9
12
15
18
Input Voltage (V)
PWM Duty Cycle (%)
PWM Dimming Linearity
fPWM = 20kHz
PWM Dimming (20kHz)
100
80
60
40
20
0
VPWM
VOUT
ILED
AC Coupled
fPWM = 2kHz
VIN = 3.6V, L = 22μH, ILED = 25mA, 6S4P LEDs
Time (20μs/div)
0
20
40
60
80
100
PWM Duty Cycle (%)
SG Micro Corp
AUGUST 2015
www.sg-micro.com
5
High Efficiency, 4-Channel,
38V Boost White LED Driver
SGM3741B
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.6V, ILED = 25mA, 6-Series 4-Parallel LEDs, L = 22μH, CIN = 10μF, COUT = 1μF, TA = +25℃, unless otherwise noted.
Soft-Start
Steady State Switching
AC Coupled
VOUT
VCTRL
VOUT
VSW
IL
ILED
IL
VIN = 3.6V, L = 22μH, ILED = 25mA, 6S4P LEDs
VIN = 3.6V, L = 22μH, ILED = 25mA, 6S4P LEDs
Time (2ms/div)
Time (800ns/div)
SG Micro Corp
AUGUST 2015
www.sg-micro.com
6
High Efficiency, 4-Channel,
38V Boost White LED Driver
SGM3741B
FUNCTIONAL BLOCK DIAGRAM
VOUT
Internal Power
Vp
LDO
VIN
VOUT Sense
& OVP
OSC & RAMP GEN
(600kHz)
SW
MOSFET
Driver
PWM/PFM
Logic
PWM
+
ILIMIT
_
IMAX
Current
Sense
+
+
VOUT
Σ
RS0
PGND
Open & Short
Detection
GM
AMP
Highest VF
String Detect
VREF1
R
C
CH4
CHx
CH1
.
.
.
RSET2
+
-
+
_
RS1
Channel X
RSET1
Enable
Control
VDimming
+
-
PWM Dimming
&
CTRL
Soft-Start
RS4
RPULL_DOWN
Internal Power
RPULL_UP
PWM
GND
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
AUGUST 2015 ‒ REV.A to REV.A.1
Page
Changed Electrical Characteristics section..........................................................................................................................................................4
Changes from Original (NOVEMBER 2014) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
AUGUST 2015
7
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TQFN-3×3-16L
D
e
N16
N1
L
D1
E
E1
k
N5
b
BOTTOM VIEW
TOP VIEW
1.7
0.7
A
3.6 2.2 1.7
A1
A2
SIDE VIEW
0.5
0.24
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.028
0.000
0.203 REF
0.008 REF
2.900
1.600
2.900
1.600
3.100
1.800
3.100
1.800
0.114
0.063
0.114
0.063
0.122
0.071
0.122
0.071
D1
E
E1
k
0.200 MIN
0.500 TYP
0.008 MIN
0.020 TYP
b
0.180
0.300
0.300
0.500
0.007
0.012
0.012
0.020
e
L
SG Micro Corp
www.sg-micro.com
TX00081.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TQFN-3×3-16L
13″
12.4
3.35
3.35
1.13
4.0
8.0
2.0
12.0
Q1
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
TX20000.000
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